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    <title>波普商店</title>
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    <header><h1>🎨 波普商店</h1><button id="cart">🛒 <span>0</span></button></header>
    <main><div class="product"><img src="https://picsum.photos/300/200" alt="产品"><h3>波普艺术品</h3><p>¥299</p><button class="buy">购买</button></div></main>
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